I've drawn Rika again. I just wanted to include this as an example of the difference between regular chibi, earlier posted, and a stylized chibi. The stylized ones have a more proportional level of detail, but are still not full-sized.

regular chibis are about two heads tall and have simplified detail

stylized are three or four heads tall and have greater detail, but usually still caricatured features, like really large ears, big noses, tiny hands and feet, huge tails, etc.